In Indonesian, both subjective and objective pronouns are the same. Possessive pronouns are slightly different in informal situations only. Below is the table:

English

Formal

Informal

Informal Possesive

I

Saya

Aku

-ku

You

Anda

Kamu

-mu

He/She/It

Beliau

Dia

-nya

We (inclusive)

Kita

Kita

Kita

We (exclusive)

Kami

Kami

Kami

You (Plural)

Kalian

Kalian

Kalian

They

Mereka

Mereka

Mereka

Note that there are two notions of "we" in Indonesian. If the opposite party is included, then we use "kita". Otherwise, we use "kami".

Contoh (Example):

Budi: "Wati, ini buku kita." (= Wati, this is our book.)

Here, Budi speaks to Wati that this book is both Budi's and Wati's book. However, if Budi said, "Wati, ini buku kami."; it means that this book is Budi's (and probably his other friend's), but not Wati's.

To refer a third person that has already died, He/She/It, when person we are speaking about already passed away and we want to refer to those people with respect, we use another word almarhum meaning "he" when the he is already died and "he" happens to be a respectable person. For female we use the word almarhumah. This is a rare instance when Bahasa Indonesia is gender specific. This is a loan word from Arabic which literally means: "who was blessed by God." In this sense, this is actually a euphemism. So we can conclude that words 'almarhum' and 'almarhumah' are purposed to Muslims. The non-Muslim people usually change it with 'mendiang', which is simpler and can be used by both genders.

In most languages there is the possibility of both adjective-like posessives "this is my book" and noun like adjectives "this book is mine" or "this is mine." Indonesian doesn't do this exactly like this but does have an equivalent:

Buku ini punyaku.(This book is mine)

Buku ini punyamu.(This book is yours)

Buku ini punyanya.(This book is his/hers/its)

Buku ini punya aku.(This book is mine)

Buku ini punya kami.(This book is ours) (exclusive)

Buku ini punya kita.(This book is ours) (inclusive)

Buku ini punya mereka.(This book is theirs)

Buku ini punya Budi.(This book is Budi's)

Ini punyaku.(This is mine)

Notice that this kind of structure is "bridged" by the word "punya", which means "to have". You can then put the appropriate suffix or word to indicate the ownership.

A synonym of "punya" is "milik". Hence you can change "punya" with "milik".

Note that at the third example we use "bukan" to deny the noun (i.e. the pen). At the fourth example, we use "tidak" to deny the ownership, which is considered as a verb (i.e. "doesn't have"). Note also how we can put names in ownership at example five and six with the word "punya".